diff --git a/development/cmake/modules/LyXMacros.cmake b/development/cmake/modules/LyXMacros.cmake
index 501da119a8..e221af1e36 100644
--- a/development/cmake/modules/LyXMacros.cmake
+++ b/development/cmake/modules/LyXMacros.cmake
@@ -430,12 +430,13 @@ function(determineversionandbuildtype configfile package version dirs date build
       setstripped(PACKAGE_VERSION ${_PV})
       setstripped(PACKAGE_BUGREPORT ${_PBU})
       set(${package} ${PACKAGE_BASE} ${PACKAGE_VERSION} ${PACKAGE_BUGREPORT} PARENT_SCOPE)
-      if(PACKAGE_VERSION MATCHES "^\([0-9]+\)\\.\([0-9]+\)\(\\.\([0-9]+\)\(\\.\([0-9]+\)\)?\)?-?\([a-z]*[0-9]*\).*$")
+      if(PACKAGE_VERSION MATCHES "^\([0-9]+\)\\.\([0-9]+\)\(\\.\([0-9]+\)\(\\.\([0-9]+\)\)?\)?-?\([A-Za-z]*[0-9]*\).*$")
         set(LYX_MAJOR_VERSION ${CMAKE_MATCH_1})
         set(LYX_MINOR_VERSION ${CMAKE_MATCH_2})
         set(LYX_RELEASE_LEVEL ${CMAKE_MATCH_4})
         set(LYX_RELEASE_PATCH ${CMAKE_MATCH_6})
-        set(LYX_BUILD_TYPE ${CMAKE_MATCH_7})
+        set(LYX_BUILD_TYPE_MATCH ${CMAKE_MATCH_7})
+        string(TOLOWER "${LYX_BUILD_TYPE_MATCH}" LYX_BUILD_TYPE)
         set(LYX_DIR_VER "LYX_DIR_${CMAKE_MATCH_1}${CMAKE_MATCH_2}x")
         set(LYX_USERDIR_VER "LYX_USERDIR_${CMAKE_MATCH_1}${CMAKE_MATCH_2}x")
         if (NOT LYX_RELEASE_LEVEL)